Waste pipe and hose fittings for caravans, camper vans and motorhomes provide essential grey water drainage systems connecting sinks, showers and appliances to waste tanks or external outlets. Available in standard sizes including 20mm, 23.5mm, 28.5mm and rigid pipework, these fittings accommodate different installation requirements from basic sink connections to comprehensive waste water systems. Popular components include angled and straight sink waste fittings, convoluted grey hose, push-fit connectors, drain taps with BSP threads, and specialized adapters for connecting different pipe sizes and systems.
Installation of waste fittings requires careful planning to ensure proper drainage gradients and prevent blockages in grey water systems. Convoluted hose in 23.5mm diameter suits most caravan applications but larger 28.5mm or rigid 32mm domestic pipework provides better flow rates for motorhomes with showers and multiple outlets. Essential components include waste traps to prevent odours, tank fittings with threaded connections, slide valves for controlled emptying, and bayonet fittings for quick-connect external discharge. Modern systems often incorporate push-fit connections allowing easy assembly and maintenance access, whilst specialized tools like drain taps and extension hoses facilitate waste tank emptying at disposal points.
Maintenance and troubleshooting waste systems involves regular cleaning to prevent fat and debris buildup that causes slow drainage and unpleasant odours. Common issues include sagging flexible pipes reducing flow efficiency, blocked convoluted hose sections trapping waste matter, and inadequate fall preventing proper drainage when vehicles aren't level. Tank cleaning products help eliminate accumulated deposits, whilst enzyme-based cleaners maintain system hygiene during regular use. One consideration is that smaller diameter waste pipes like 20mm create drainage bottlenecks when serving multiple outlets, making 28.5mm or larger pipework preferable for comprehensive motorhome waste systems with showers and kitchen facilities.
Complete kit to connect up to 2 Waste Outlets Comprises of: 2 x 28
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Drain tap, threaded 3/4" BSP. Normally used to drain on-board tanks
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Tank fitting 1" hose nozzle to 3/4" BSP male parallel thread with seal
Drain tap with 1 1/4" BSP female thread at each end. Use part 139570 t
40mm drain valve for inboard waste tank. Quick emptying due to larger
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Bayonet fitting for connecting to slide valve 235637. Angled at 45 deg
2 metre extension hose for Ultradrain ref. 152932
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Superflex hose for the 3" waste system. Sold per metre. Fits to parts
3" slide valve with cap short handle - pulls out to 150mm approx.
Colapz has redefined waste management in outdoor settings with its inn
Crafted with precision and practicality in mind, the Colapz Motorhome
COLAPZ 1 X COLAPZ Flexi Waste Pipe Double Adaptor.Fits standard double
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The COLAPZ Waste Pipe - Extendable 1 Metre is a versatile and essentia
To be used with shower tray 220103 - High quality shower tray waste f
The Reich Odour Trap is an essential component for any caravan, motorh
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The Reich Tank Drainer with Shut-off Valve is an innovative solution m
Frequently Asked Questions
What size waste pipe do I need for my caravan or motorhome?Most caravans use 23.5mm or 28.5mm waste pipe, with 23.5mm suitable for basic sink drainage and 28.5mm better for motorhomes with showers. Larger vehicles benefit from 32mm rigid domestic pipework for improved flow rates. Avoid 20mm pipe for multiple outlets as it creates drainage bottlenecks. Consider your waste water volume and number of outlets when selecting pipe diameter.Why does my caravan waste water drain slowly?Slow drainage typically results from sagging flexible pipes, blocked convoluted hose sections, or inadequate fall in the pipework. Check your vehicle is level, straighten any sagging pipes, and clean accumulated debris from convoluted sections. Fat and food particles commonly block narrow pipes, whilst insufficient gradient prevents proper water flow. Consider upgrading to larger diameter rigid pipework for better performance.What's the difference between convoluted hose and rigid waste pipe?Convoluted hose is flexible with corrugated walls, making it easy to route but prone to blockages in the ridges. Rigid waste pipe provides smooth internal surfaces for better flow but requires more precise installation with proper fittings. Convoluted hose suits short runs with few direction changes, whilst rigid pipework is preferable for complex systems with multiple outlets and longer runs.How do I connect different sized waste pipes together?Use stepped connectors or adapters to join different pipe sizes - for example, 28mm to 23.5mm reducers or push-fit adapters. Many sink waste fittings connect to small convoluted pipe sections that then adapt to larger rigid pipework. Ensure watertight seals using appropriate sealing sleeves or jubilee clips. Push-fit systems offer the most flexibility for mixed-size installations.Do I need waste traps in my caravan plumbing system?Waste traps prevent odours from grey water tanks entering your living space and are highly recommended for sink and shower installations. Use shallow bottle traps where space is limited, or HepVo valves as space-saving alternatives. Traps require adequate fall to function properly, and some systems use simple water seals in pipework bends to achieve the same odour-blocking effect.What BSP thread sizes are used for caravan waste tank connections?Common BSP thread sizes include 3/4" for basic drain taps, 1" for standard tank connections, and 1 1/4" for larger motorhome waste systems. Tank fittings often use 1" BSP male threads connecting to hose nozzles, whilst drain valves typically feature 3/4" or 1 1/4" BSP female connections. Always match thread sizes and use appropriate sealing washers to prevent leaks.
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